Gas-filter.



PATENTED MAR'. 27, 1906.

G. A. "s-T'BBBINS.

.GAS FILTER. APPLICATION FILED M'Are. 190s.

[NVE/W0 george JV'. ,6221551326 By i Ammers No. 816,266. PATBNTED MAR. 2'7, 1906.

G. A. sTEBBINs. GAS FILTER.

APPLIOATION FILED MAYG, 1905.

2 SHEETS-SHEET 2.

WITNESSES:

UNITED sTATEs PATENT oEEroE. GEORGE ALFRED sfTEBBi-Ns, or wATERTowN, NEW Yo'Rk.

GAS-FILTER.

Spcification of ietters' atent.

To all whom it may concern:

Beit known that l, GEORGE ALFRED STEB- BINS, a citizen of the United States, and a resident of Watertown, in the county of Jefferson and State of New York, have invented a new and Improved Gas-Filter, of which the following is a full, clear, and exact description.

My invention relates to suliite apparatus, my moreparticular object being to equip the digester with a suitable filter, togetherwith means forY preventing the filter from fouling.

Reference is to be had to the accompanying drawings, forming a partof this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 is a fragmentary section showing the top of the digester equipped with my invention. Fig. 2 is an inverted plan or bottom view of the filter, showing the meansfor securing thevsame within the digester. Fig. 3 is a plan view of the spider 15, used to prevent the filter from fouling. Fig. 4 is a vertical section through the spider 15, taken upon the line 4 4 of Fig. 3, looking in the direction of the arrow; and Fig. 5 is a vertical cross-section showing another form of means for holding the filter in position.

The body of the digester is shown at 6, the acid-proof lining at 7, and the neck at 8. The cover is shown at 9 and is provided with an acid-'proof lining 10. Mounted rigidly upon the lining 10 and concentric withthe center thereof is an annular bead 11, and secured upon this bead isa filter 12, consisting of a' disk plate, of acid-proof material, provided with holes 13 14, disposed, preferably, in radial rows, as indicated in Flg. 2. This filter is secured in position by means of threaded bolts 16, which penetrate the annular bead 11.

In the forni shown in Fig. 5 the filter 12aL is secured in position by comparatively long bolts 16a, which pass directly through an annular collar 11a into a lining 10a, the collar 1lk1 being separate therefrom. The spider 15 is encircled by the annular bead 11 (or the collar 11a) and is provided with a number of bosses 17, screw-threaded and secured rigidly upon its under face, so as to aline with the holes 13 in the filter. Guide-pins 18, preferably four in number, are similarly screwthreaded and project downwardly from the spider 15. The guide-pins 18 register with certain holes 14 and are never entirely removed therefromwhile the device is in action.

The spider is providedwith bosses 19,.prefer ably integral therewith and .projecting vupwardly therefrom. The spider isfurther provided with a stirrup-swivel 20, having an aperture 21, which receives a Yhead 22,' rigidly mounted upon a revoluble stem 23 23?. y

In Fig.' l a stufling-boxVA 24.encircles` the stern 23 and is provided with a hand-wheel 25, whereby the stem 23 and thehead. 22 may be turned. The stem 23 is.threaded at 26 and when turned by the hand-wheel 25 is slightly raised or lowered, as will be understood from Fig. 1. An elbow 27 isprovided with a flange28, which is securedin position by means of bolts 29 upon a. collar.30. .A In Fig. 5.a T 27 a is provided-witltaiiange 27h,- and this flange is vmated .by a flange 27 c, which is integral witha cap 27d. ,',The revoluble stem 23ais provided Vwith a thread 26a, which works freely through the. cap. 279.v c .A stufling-box carried by the cap 27Cl closely encircles the stem 23a. ,Y

The operation of my Ydevice isgasA follows: As is well known, dlgesters used. in the manufacture of wood-pulp fiber are fillednearly full with chips of wood, andthe sti-'called ycooking liquor is supplied in sufficient quantity to practically cover the chips, the aggregate quantity of the chips and cookingliqiir being such that a little s Vace is left atv the top after Jfilling. Steam lgeing admitted, however, condenses quite rapidly, and this .causes the volume of the liquid within the. digester to increase to such a point that. some ofthe chips are raised into contact with thellining of the digester-cover. The filter 12 is provided for the purpose of preventing the chips from passing upwardly out of the apparatus through the elbow 27 or T 27a; but if no other mechanism were present the chips would clog the holes 13, so as to prevent gases from escaping in the customary manner. It is upon this account that 'I provide the spider 15, together with the means for moving the same vertically. 1 Whenever the chips tend to cause fouling of the filter 12, by turning the hand-wheel 25 and forcing the stem 23 downwardly the bosses 17 are forced through the holes 13, and thus dislodge such of the chips as obstruct the holes. This being done, the hand-wheel 25 is turned in the opposite direction and the stem 23 and the head 22 raised,

so as to elevate the spider 15 to its normal position. The lugs 19 bind against the lining 10 and prevent excessive upward movement of the spider 15. When the parts are in their IOO normal position, as indicated in Fig. 1, the iilter 12 oiiers no undue obstruction to the exit of the gases from the digester, and yet with a sliding movement of the hand-wheel 25 the spider 15 can be lowered, so that the lugs 17 assume their lowermost position. The guide-pins 1S prevent the bosses 17 from moving out of registry with the holes 13.

I do not limit myself to any particular mechanism for raising and lowering the spider, nor to the exact shape of spider shown, nor to the materials of which any of the parts are composed, nor to the exact construction shown and described, for the reason that vae rious changes in the construction may be made without departing from the spirit of my invention.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The combination of a digester provided with a cover, an annular member connected with said cover and depending into said digester, a iilter having substantially the form of a disk and connected with said annular member being disposed substantially parallel with the general plane of said cover and being provided with apertures, a spider disposed intermediate of said iilter and said cover, bosses mounted upon said spider and adapted to enter said apertures, guide-pins mounted upon said spider and projecting into others of said apertures for the purpose of holding said s ider in a predetermined rela tion to said iiiter, and a manually-operated stem connected with said spider for raising and lowering the same.

2. The combination of a digester, a cover therefor, a iilter disposed adjacent to said cover and spaced therefrom, a spider mount ed intermediate of said filter and said cover, means for moving said spider relatively to said filter, bosses connected with said spider and adapted to engage said filter for the urpose of preventing the same from fou ing,

guides for said spider, a stirrup-swivel conn nected with said spider, and a manually-op erated stem provided with a head engaging said stirrup-swivel for the purpose of moving said spider relatively to said iilter.

3. The combination of a containing vessel, a T connected therewith for allowing the passage of steam and gases therefrom, said T being provided with a ange, a cap mounted upon said T and provided with a ilange mating said flangeof said T, a stuffing-box con nected with said cap and supported thereby, a revoluble stem engaging said cap and said stuffing-box, means for actuating said stem, and a gas-filtering member connected with said stem and adapted to prevent the passage of coarse substances from said containing vessel to said T.

4. The combination of a digester, a cover therefor, said cover being provided with an annular member, a filter connected with said annular member and provided with holes, a sp .der encircled by said annular member and provided with bosses adapted to enter said holes, means for causing said bosses to aline with said holes, and mechanism for shifting 'pllie position of said spider relatively to said ter.

5. The combination of a digester, a lilter connected therewith for allowing the escape of gases therefrom while preventing the escape of other materials, and a member movable toward and from said filter and provided with means for preventing said 'filter from fouling, said member being further provided with beads serving as limiting-stops for engaging the digester.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

GEORGE ALFRED STEBBINS.

I/Vitnesses:

HERBERT S. LUTHER, GERTRUDE A. GAEFNEY. 

